cicyt UNIZAR
Full-text links:

Download:

Current browse context:

cond-mat.mtrl-sci

Change to browse by:

References & Citations

Bookmark

(what is this?)
CiteULike logo BibSonomy logo Mendeley logo del.icio.us logo Digg logo Reddit logo ScienceWISE logo

Condensed Matter > Materials Science

Title: Giant photoinduced lattice distortion in oxygen-vacancy ordered SrCoO2.5 thin films

Abstract: Despite of the tremendous studies of oxygen vacancy formation and migration in determining the structural evolution and property optimization of multivalent transition metal oxides, few has focused on the transient dynamic behaviors in the oxygen vacancy enrichment system under non-equilibrium states. In this work, we performed multi-timescale ultrafast X-ray diffraction techniques to monitor the structural dynamics in the oxygen-vacancy ordered SrCoO2.5 thin films and observed an unanticipatedly giant lattice distortion. Time-resolved synchrotron X-ray diffraction measurements were applied in the SrCoO2.5 thin films upon excitation of different photon energies for the SrCoO2.5 films with the different thicknesses. The giant magnitude of photoinduced strain ({\Delta}c/c > 1 %) and its distinct correlation with the pump photon energy indicate an undoubtedly non-thermal origin of the photoinduced strain. The sub-picosecond resolution X-ray diffraction reveals that the formation and propagation of the coherent acoustic phonons and further elongates the maximum distortion in the magnitude by 1.4 times at early time points. We propose a plausible mechanism for the giant lattice distortion upon the 400-nm-laser photoexcitation that it is the p-d charge transfer induced the rearrangement of the tilted Co-O octahedral induces the giant c-axis elongation.
Comments: 15 pages, 3 figures, support material
Subjects: Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:1803.06780 [cond-mat.mtrl-sci]
  (or arXiv:1803.06780v1 [cond-mat.mtrl-sci] for this version)

Submission history

From: Bingbing Zhang [view email]
[v1] Mon, 19 Mar 2018 01:50:41 GMT (1063kb)